Tech Support Forum - View Single Post - constant reboot after adding 64 meg SDRAM

Chevy · 04-30-2005, 07:49 PM

Two issues here:

Memory Speed - Is original SDRAM PC100? How about the new?

CAS Latency - Is the old SDRAM CL2/2.5/3? What about the new?

All memory sticks take their cue from the one in the first slot. So, you want your slowest stick as the lead.

If the original sticks are both PC100 CAS X, and the new stick is PC133 with the same CAS rating, then putting the fastest (the new one in this case) last should work. IT will also work if the new stick has a better (lower) CAS rating than the original.

However, if it is faster RAM with a worse CAS rating, it will not work. The Speed and CAS levels can adjust to a slower level, but not to a higher one.

If your new stick has a slowes CAS rating, check out your BIOS. You may be able to manual set the CAS rate their. Set it to 3 and you may be ok.

04-30-2005, 07:49 PM	#4 (permalink)
Chevy Retired Join Date: Jul 2003 Location: Notlob Posts: 5,440 OS: Vista Ultimate My System	Two issues here: Memory Speed - Is original SDRAM PC100? How about the new? CAS Latency - Is the old SDRAM CL2/2.5/3? What about the new? All memory sticks take their cue from the one in the first slot. So, you want your slowest stick as the lead. If the original sticks are both PC100 CAS X, and the new stick is PC133 with the same CAS rating, then putting the fastest (the new one in this case) last should work. IT will also work if the new stick has a better (lower) CAS rating than the original. However, if it is faster RAM with a worse CAS rating, it will not work. The Speed and CAS levels can adjust to a slower level, but not to a higher one. If your new stick has a slowes CAS rating, check out your BIOS. You may be able to manual set the CAS rate their. Set it to 3 and you may be ok.